Snowflake cleaning device for plastic part spraying pretreatment

Abstract

The utility model relates to the technical field of snowflake cleaning devices, and discloses a snowflake cleaning device for plastic part spraying pretreatment, which comprises a base, the lower end of the base is fixedly connected with a pulley, the upper end of the base is fixedly connected with a top plate, and the upper end of the top plate is fixedly connected with a slide rail assembly 1. According to the snowflake cleaning device for spraying pretreatment of the plastic parts, the spray gun assembly can accurately control the flow, when the snowflake cleaning device is used, a worm is driven to rotate by controlling an adjusting key and starting a motor according to requirements, the worm drives a worm gear and a first adjusting part which are in meshed connection to rotate, and the first adjusting part is in meshed connection with a second adjusting part through a gear; the second adjusting part and the first adjusting part rotate at the same speed in the opposite directions, so that the opening degree in the main pipe is adjusted, the purpose of adjusting the flow is achieved, the cleaning device can select a multi-axis mechanical arm to automatically conduct snowflake cleaning on plastic parts, and a spray gun assembly can be manually used for conducting snowflake cleaning on corners difficult to clean through a spray head. And the requirements of different cleaning scenes are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to snow washing device technical field, concretely is a kind of snow washing device for plastic parts spraying pretreatment. BACKGROUND

[0002] In the plastic product processing industry, spraying is an important surface treatment process, which can give plastic products an attractive appearance and certain protective properties. However, before spraying, the cleanliness of the surface of the plastic parts has a crucial impact on the spraying effect. If the surface of the plastic parts has oil stains, dust, release agent and other impurities, it will cause quality problems such as poor adhesion, uneven surface and blistering of the coating after spraying, which seriously affects the product's pass rate and service life. Snow washing is a new environmentally friendly cleaning technology that uses snowflake-shaped particles produced by the instantaneous gasification and expansion of liquid carbon dioxide under certain conditions to impact and clean the surface of objects. The snowflake particles have enough kinetic energy to remove surface impurities without damaging the surface of the plastic parts. Carbon dioxide itself is non-toxic, odorless and non-polluting, and does not leave harmful substances on the surface of the plastic parts after cleaning, so it does not need to be dried, meeting the requirements of environmental protection and efficient production.

[0003] Chinese utility model patent publication No. CN 215844660 U discloses a supercritical carbon dioxide jet cleaning device. The device includes a control panel, side cleaning drums and top cleaning drums. When the device is in use, the equipment to be cleaned is placed at the lower end of the device, and then the device is powered on. The side cleaning drums and top cleaning drums are controlled to rotate by the control panel, thereby automatically cleaning the equipment to be cleaned. The device is simple and convenient to operate, does not require manual cleaning, and is suitable for practical use. However, the supercritical carbon dioxide jet cleaning device has a large volume, is not convenient for workers to hold and clean, has a small range of application, and is not convenient to use. SUMMARY

[0004] The utility model solves the technical problem of providing a snow washing device for plastic parts spraying pretreatment, which effectively solves the problems in the prior art.

[0005] The utility model discloses a technical scheme adopted is: a kind of snow washing device for the pretreatment of plastic parts spraying, including base, the lower end of base is fixedly connected with pulley, the upper end of base is fixedly connected with top plate, the upper end of top plate is fixedly connected with slide rail assembly one, the upper end of slide rail assembly one is provided with slide rail assembly two, the upper end of slide rail assembly two is provided with multi-axis mechanical arm, the end of multi-axis mechanical arm away from slide rail assembly two is fixedly connected with spray head, the upper end of base is fixedly connected with locking assembly and confluence box, one side of confluence box is provided with liquid carbon dioxide tank, the outside of liquid carbon dioxide tank is fixedly connected with fixed plate, the gas outlet end of liquid carbon dioxide tank is fixedly connected with flow valve, the other side of confluence box is provided with compressed gas tank, the side of confluence box away from multi-axis mechanical arm is provided with control panel, the side of confluence box close to multi-axis mechanical arm is provided with electromagnetic valve one, the output of electromagnetic valve one is fixedly connected with connecting pipe, the side of confluence box away from multi-axis mechanical arm is fixedly connected with electromagnetic valve two, the output of electromagnetic valve two is fixedly connected with hose, the output of hose is fixedly connected with spray gun assembly.

[0006] The spray gun assembly includes a main pipe, a spray pipe, a handle, an adjustment button, a grip, a control switch, a rotating rod, a flow adjustment plate, a gear, a grip, a control switch, a rotating rod, a flow adjustment plate, a gear, an adjustment piece one, an adjustment piece two, a shaft seat, a worm gear, a worm, a motor and a protective cover. The output end of the main pipe is fixedly connected with the spray pipe. The lower end of the main pipe is fixedly connected with the handle. The outer side of the handle is fixedly connected with the adjustment button. The outer side of the spray pipe is fixedly connected with the grip. The side of the grip away from the handle is fixedly connected with the control switch. The rotating rod is rotatably connected inside the main pipe. The outer side of the rotating rod is fixedly connected with the flow adjustment plate. The upper end of the rotating rod is fixedly connected with the gear. The rotating rod, the flow adjustment plate and the gear jointly constitute the adjustment piece one. The main pipe is provided with the adjustment piece one inside. The upper end of the main pipe is fixedly connected with the shaft seat. The upper end of the shaft seat is rotatably connected with the worm. The center of the shaft seat is rotatably connected with the worm. The front end of the shaft seat is fixedly connected with the motor. The upper end of the main pipe is fixedly connected with the protective cover.

[0007] Preferably, the slide rail assembly one and the slide rail assembly two are perpendicular to each other. The connecting pipe and the spray head are in communication with each other.

[0008] Through the above technical scheme, the multi-axis mechanical arm can move in two perpendicular directions, achieving a full range of operation, so that different positions of the plastic parts can be flexibly snow washed.

[0009] Preferably, the locking assembly comprises a fixed seat, a lock head, a collar one, a rotating seat, a lock catch and a collar two, the outer side of the fixed seat is fixedly connected with the lock head, the upper end of the fixed seat is fixedly connected with the collar one, the front end of the fixed seat is rotatably connected with the rotating seat, the outer side of the rotating seat is fixedly connected with the lock catch, the upper end of the rotating seat is fixedly connected with the collar two, the locking assembly is provided with two symmetrical and identical ones, the collar one and the collar two are adapted to the outer wall of the liquid carbon dioxide tank and the compressed gas tank, and the lock head and the lock catch are snap-connected.

[0010] Through the above technical scheme, the locking assembly can firmly fix the liquid carbon dioxide tank and the compressed gas tank, the collar one and the collar two are adapted to the outer wall of the tank body, so that the tank body cannot shake during work, and the snap connection of the lock head and the lock catch facilitates installation and removal, and also facilitates replacement of the liquid carbon dioxide tank and the compressed gas tank.

[0011] Preferably, the compressed gas tank has the same structure as the liquid carbon dioxide tank.

[0012] Through the above technical scheme, the production and maintenance costs are reduced.

[0013] Preferably, the adjusting part one and the adjusting part two are symmetrical and identical in structure, the adjusting part one and the adjusting part two are meshingly connected through two gears, the gear of the adjusting part one is fixedly connected with the worm wheel, and the worm is meshingly connected with the worm wheel.

[0014] Through the above technical scheme, the spray gun assembly can accurately control the flow rate through the adjusting part one and the adjusting part two, and when in use, the flow rate is adjusted by controlling the adjusting button, starting the motor to drive the worm to rotate, and the worm drives the meshingly connected worm wheel and adjusting part one to rotate, the adjusting part one is meshingly connected with the adjusting part two through the gear, and the adjusting part two and the adjusting part one rotate at the same speed in opposite directions, so as to adjust the opening degree inside the main pipe and achieve the purpose of adjusting the flow rate.

[0015] Preferably, the cross-sectional area of the spray pipe gradually decreases from the input end to the output end.

[0016] Through the above technical scheme, the carbon dioxide snowflake crystals can be accelerated in the spray pipe, so as to obtain a higher jet speed at the spray head, enhance the cleaning strength on the surface of the plastic part, effectively remove dirt and impurities, and improve the snowflake cleaning effect.

[0017] Preferably, the control switch is electrically connected with the electromagnetic valve two, the adjusting button is electrically connected with the motor, and the control panel is electrically connected with the confluence box, the liquid carbon dioxide tank, the compressed gas tank, the slide rail assembly one and the slide rail assembly two.

[0018] Through the technical scheme, the snow washing device can use a multi-axis mechanical arm to automatically clean the plastic parts with carbon dioxide snow crystals, and can also use a spray gun assembly to manually clean corners that are difficult to clean with a spray head with carbon dioxide snow crystals, and has strong selectivity.

[0019] Compared with the prior art, the snow washing device for plastic part spraying pretreatment has the following beneficial effects:

[0020] 1. The snow washing device for plastic part spraying pretreatment can accurately control the flow rate through the adjusting piece one and the adjusting piece two, and when in use, the flow rate can be adjusted by controlling the adjusting button, starting the motor to drive the worm to rotate, and the worm drives the meshed worm gear and adjusting piece one to rotate. The adjusting piece one is meshed with the adjusting piece two through the gear, and the adjusting piece two rotates at the same speed in the opposite direction of the adjusting piece one, so as to adjust the opening of the main pipe and achieve the purpose of adjusting the flow rate. The snow washing device can use a multi-axis mechanical arm to automatically clean the plastic parts with carbon dioxide snow crystals, and can also use a spray gun assembly to manually clean corners that are difficult to clean with a spray head with carbon dioxide snow crystals, and has strong selectivity, which meets the needs of different cleaning scenes, and the pulley at the lower end of the base makes the whole device easy to move.

[0021] 2. The snow washing device for plastic part spraying pretreatment can firmly fix the liquid carbon dioxide tank and the compressed gas tank, and the clamping ring one and the clamping ring two are matched with the outer wall of the tank body to ensure that the tank body does not shake during work. The locking head and the lock catch are connected by buckling to facilitate installation and disassembly, and also facilitate replacement of the liquid carbon dioxide tank and the compressed gas tank. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The utility model discloses a three-dimensional structure schematic diagram Figure 1 ;

[0023] Figure 2 The utility model discloses a three-dimensional structure schematic diagram Figure 2 ;

[0024] Figure 3 The utility model discloses a three-dimensional structure schematic diagram Figure 2 ;

[0025] Figure 4 The utility model discloses a three-dimensional structure schematic diagram

[0026] Figure 5 The utility model discloses a three-dimensional structure schematic diagram

[0027] Figure 6 The utility model discloses a three-dimensional structure schematic diagram

[0028] Figure 7 The utility model discloses a spray gun assembly split structure schematic Figure 1

[0029] Figure 8 The utility model discloses a spray gun assembly split structure schematic Figure 2

[0030] 1, base, 2, pulley, 3, top plate, 4, slide rail assembly one, 5, slide rail assembly two, 6, multi-shaft mechanical arm, 7, spray head, 8, locking assembly, 801, fixed seat, 802, lock head, 803, ring one, 804, transfer seat, 805, lock catch, 806, ring two, 9, liquid carbon dioxide tank, 10, fixed plate, 11, flow valve, 12, compressed gas tank, 13, confluence box, 14, control panel, 15, electromagnetic valve one, 16, connecting pipe, 17, electromagnetic valve two, 18, hose, 19, spray gun assembly, 1901, main pipe, 1902, spray pipe, 1903, handle, 1904, adjusting button, 1905, handle, 1906, control switch, 1907, rotating rod, 1908, flow regulating plate, 1909, gear, 1910, adjusting part one, 1911, adjusting part two, 1912, axle seat, 1913, worm wheel, 1914, worm, 1915, motor, 1916, protective cover. DETAILED DESCRIPTION

[0031] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative work belong to the range of the utility model protection.

[0032] Embodiment one: as Figures 1-8 ​​The utility model provides a snowflake cleaning device for plastic piece spraying pretreatment, including base 1, the lower end fixed connection of base 1 has pulley 2, the upper end fixed connection of base 1 has top plate 3, top plate 3 upper end fixed connection has slide rail assembly one 4, the upper end of slide rail assembly one 4 is provided with slide rail assembly two 5, the upper end of slide rail assembly two 5 is provided with multi -shaft mechanical arm 6, the one end fixed connection of multi -shaft mechanical arm 6 away from slide rail assembly two 5 has spray head 7, the upper end fixed connection of base 1 has locking assembly 8 and confluence box 13, one side of confluence box 13 is provided with liquid carbon dioxide tank 9, the outside fixed connection of liquid carbon dioxide tank 9 has fixed plate 10, the gas outlet fixed connection of liquid carbon dioxide tank 9 has flow valve 11, the other side of confluence box 13 is provided with compressed gas tank 12, the side away from multi -shaft mechanical arm 6 of confluence box 13 is provided with control panel 14, the side close to multi -shaft mechanical arm 6 of confluence box 13 is provided with electromagnetic valve one 15, the output fixed connection of electromagnetic valve one 15 has connecting pipe 16, the side away from multi -shaft mechanical arm 6 of confluence box 13 is fixedly connected with electromagnetic valve two 17, the output fixed connection of electromagnetic valve two 17 has hose 18, the output fixed connection of hose 18 has spray gun assembly 19;

[0033] Spray gun assembly 19 includes main pipe 1901, spray pipe 1902, handle 1903, adjustment button 1904, handle 1905, control switch 1906, rotating rod 1907, flow regulating plate 1908, gear 1909, handle 1905, control switch 1906, rotating rod 1907, flow regulating plate 1908, gear 1909, adjustment piece one 1910, adjustment piece two 1911, shaft seat 1912, worm gear 1913, worm 1914, motor 1915 and protective cover 1916, the output fixed connection of main pipe 1901 has spray pipe 1902, the lower end fixed connection of main pipe 1901 has handle 1903, the outside fixed connection of handle 1903 has adjustment button 1904, the outside fixed connection of spray pipe 1902 has handle 1905, the side fixed connection of handle 1905 away from handle 1903 has control switch 1906, rotating rod 1907 is rotatably connected in main pipe 1901, the outside fixed connection of rotating rod 1907 has flow regulating plate 1908, the upper end fixed connection of rotating rod 1907 has gear 1909, rotating rod 1907, flow regulating plate 1908 and gear 1909 jointly constitute adjustment piece one 1910, main pipe 1901 is provided with adjustment piece one 1910, the upper end fixed connection of main pipe 1901 has shaft seat 1912, the upper end rotatable connection of shaft seat 1912 has worm gear 1914, the center rotatable connection of shaft seat 1912 has worm 1914, the front end fixed connection of shaft seat 1912 has motor 1915, the upper end fixed connection of main pipe 1901 has protective cover 1916.

[0034] Specifically, the slide rail assembly one 4 and the slide rail assembly two 5 are perpendicular to each other, and the connecting pipe 16 and the spray head 7 are in communication with each other. Advantage is that the multi-axis mechanical arm 6 can move in two perpendicular directions to realize omnidirectional operation range, so that the plastic parts at different positions can be flexibly snow-flake cleaned.

[0035] Specifically, the locking assembly 8 includes a fixed seat 801, a lock head 802, a ring one 803, a rotating seat 804, a lock catch 805 and a ring two 806. The fixed seat 801 is fixedly connected with the lock head 802 outside, and the fixed seat 801 is fixedly connected with the ring one 803 at the upper end. The rotating seat 804 is rotatably connected with the fixed seat 801 at the front end, and the rotating seat 804 is fixedly connected with the lock catch 805 outside. The rotating seat 804 is fixedly connected with the ring two 806 at the upper end. The locking assembly 8 is provided with two symmetrical and identical ones. The ring one 803 and the ring two 806 are adapted to the outer wall of the liquid carbon dioxide tank 9 and the compressed gas tank 12, and the lock head 802 is connected with the lock catch 805. Advantage is that the locking assembly 8 can firmly fix the liquid carbon dioxide tank 9 and the compressed gas tank 12. The ring one 803 and the ring two 806 are adapted to the outer wall of the tank body to ensure that the tank body will not shake during work. The lock head 802 and the lock catch 805 are connected to facilitate installation and disassembly, and also facilitate replacement of the liquid carbon dioxide tank 9 and the compressed gas tank 12.

[0036] Embodiment two: as shown in the following figure, which is an improvement on the previous embodiment. Figures 2-8

[0037] Specifically, the compressed gas tank 12 has the same structure as the liquid carbon dioxide tank 9. Advantage is that the production and maintenance costs are reduced.

[0038] Specifically, the adjusting part one 1910 and the adjusting part two 1911 are symmetrical and identical in structure. The adjusting part one 1910 and the adjusting part two 1911 are connected by two gears 1909. The gear 1909 of the adjusting part one 1910 is fixedly connected with the worm gear 1913, and the worm 1914 is meshed with the worm gear 1913. Advantage is that the spray gun assembly 19 can accurately control the flow rate through the adjusting part one 1910 and the adjusting part two 1911. During use, the adjusting key 1904 is controlled according to the demand, the motor 1915 is started to drive the worm 1914 to rotate, the worm 1914 drives the meshed worm gear 1913 and the adjusting part one 1910 to rotate, the adjusting part one 1910 is meshed with the adjusting part two 1911 through the gear 1909, and the adjusting part two 1911 rotates in the opposite direction of the adjusting part one 1910 at the same speed, so as to adjust the opening degree of the main pipe 1901, and achieve the purpose of adjusting the flow rate.

[0039] ​Specifically, the cross-sectional area of the spray pipe 1902 gradually decreases from the input end to the output end. The advantage is that the carbon dioxide snow crystal can be accelerated in the spray pipe 1902, so as to obtain a higher jet speed at the spray head 7, enhance the cleaning strength on the surface of the plastic part, effectively remove dirt and impurities, and improve the effect of snow cleaning.

[0040] Specifically, the control switch 1906 is electrically connected with the electromagnetic valve 2 17, the adjustment button 1904 is electrically connected with the motor 1915, and the control panel 14 is electrically connected with the confluence box 13, the liquid carbon dioxide tank 9, the compressed gas tank 12, the slide rail assembly 1 4 and the slide rail assembly 2 5. The advantage is that the snow cleaning device can use the multi-axis mechanical arm 6 to automatically clean the carbon dioxide snow crystal on the plastic part, and can also manually use the spray gun assembly 19 to clean the corners of the spray head 7 which are difficult to clean, so the selectivity is strong.

[0041] Working principle: when in use, the moving path and speed of the slide rail assembly 1 4 and the slide rail assembly 2 5 are set through the control panel 14, the working track of the multi-axis mechanical arm 6 is planned according to the shape and size of the plastic part, so that the spray head 7 can cover all parts of the plastic part that need to be cleaned, the flow parameters of the liquid carbon dioxide and the compressed gas are set on the control panel 14, the appropriate snow cleaning strength is adjusted according to the pollution degree and material characteristics of the plastic part, the automatic cleaning start button on the control panel 14 is pressed, at this time, the liquid carbon dioxide and the compressed gas in the liquid carbon dioxide tank 9 and the compressed gas tank 12 enter the confluence box 13 according to the set flow to mix and form the snow cleaning medium, the electromagnetic valve 1 15 is opened, the snow cleaning medium is transported to the spray head 7 through the connecting pipe 16, and at the same time, the multi-axis mechanical arm 6 moves on the slide rail assembly 1 4 and the slide rail assembly 2 5 according to the preset track to clean the plastic part comprehensively. When it is necessary to clean the corners and other difficult-to-clean parts of the plastic part, manual cleaning operation can be performed, the worker holds the handle 1905 and the handle 1903 of the spray gun assembly 19, presses the control switch 1906, the electromagnetic valve 2 17 is opened, the snow cleaning medium is transported to the spray gun assembly 19 through the hose 18, and the snow cleaning medium is sprayed out through the spray pipe 1902 to manually clean the corners or difficult-to-clean parts of the plastic part. According to the demand, the control adjustment button 1904 is pressed to start the motor 1915 to drive the worm 1914 to rotate, the worm 1914 drives the meshed connecting worm wheel 1913 and the adjustment part 1 910 to rotate, the adjustment part 1 910 is meshed and connected with the adjustment part 2 911 through the gear 1909, the adjustment part 2 911 and the adjustment part 1 910 rotate in opposite directions at the same speed, so as to adjust the opening degree of the main pipe 1901, so as to adjust the flow.

[0042] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A snowflake cleaning device for the pre-treatment of plastic parts before painting, comprising a base (1), characterized in that: The lower end of the base (1) is fixedly connected with a pulley (2), the upper end of the base (1) is fixedly connected with a top plate (3), the upper end of the top plate (3) is fixedly connected with a slide rail assembly one (4), the upper end of the slide rail assembly one (4) is provided with a slide rail assembly two (5), the upper end of the slide rail assembly two (5) is provided with a multi-axis mechanical arm (6), the end, away from the slide rail assembly two (5), of the multi-axis mechanical arm (6) is fixedly connected with a spray head (7), the upper end of the base (1) is fixedly connected with a locking assembly (8) and a confluence box (13), one side of the confluence box (13) is provided with a liquid carbon dioxide tank (9), the outer side of the liquid carbon dioxide tank (9) is fixedly connected with a fixed plate (10), the gas outlet end of the liquid carbon dioxide tank (9) is fixedly connected with a flow valve (11), the other side of the confluence box (13) is provided with a compressed gas tank (12), one side, away from the multi-axis mechanical arm (6), of the confluence box (13) is provided with a control panel (14), one side, close to the multi-axis mechanical arm (6), of the confluence box (13) is provided with a solenoid valve one (15), the output end of the solenoid valve one (15) is fixedly connected with a connecting pipe (16), one side, away from the multi-axis mechanical arm (6), of the confluence box (13) is fixedly connected with a solenoid valve two (17), the output end of the solenoid valve two (17) is fixedly connected with a hose (18), and the output end of the hose (18) is fixedly connected with a spray gun assembly (19). Said spray gun assembly (19) comprises a main pipe (1901), a spray pipe (1902), a handle (1903), an adjusting button (1904), a grip (1905), a control switch (1906), a rotating rod (1907), a flow adjusting plate (1908), a gear (1909), an adjusting part one (1910), an adjusting part two (1911), a shaft seat (1912), a worm wheel (1913), a worm (1914), a motor (1915) and a protective cover (1916), the output end of the main pipe (1901) is fixedly connected with the spray pipe (1902), the lower end of the main pipe (1901) is fixedly connected with the handle (1903), the outer side of the handle (1903) is fixedly connected with the adjusting button (1904), the outer side of the spray pipe (1902) is fixedly connected with the grip (1905), the side, away from the handle (1903), of the grip (1905) is fixedly connected with the control switch (1906), the inside of the main pipe (1901) is rotatably connected with the rotating rod (1907), the outer side of the rotating rod (1907) is fixedly connected with the flow adjusting plate (1908), the upper end of the rotating rod (1907) is fixedly connected with the gear (1909), the rotating rod (1907), the flow adjusting plate (1908) and the gear (1909) jointly compose the adjusting part one (1910), the inside of the main pipe (1901) is provided with the adjusting part one (1910), the upper end of the main pipe (1901) is fixedly connected with the shaft seat (1912), the upper end of the shaft seat (1912) is rotatably connected with the worm (1914), the center of the shaft seat (1912) is rotatably connected with the worm (1914), the front end of the shaft seat (1912) is fixedly connected with the motor (1915), the upper end of the main pipe (1901) is fixedly connected with the protective cover (1916).

2. The snow-flake cleaning device for pre-treatment of plastic parts before painting according to claim 1, characterized in that: Said slide rail assembly one (4) and slide rail assembly two (5) are perpendicular to each other, and said connecting pipe (16) and spray head (7) are in communication with each other.

3. The snow-flake cleaning device for pre-treatment of plastic parts before painting according to claim 1, characterized in that: Said locking assembly (8) comprises a fixing seat (801), a lock head (802), a ring one (803), a rotating seat (804), a lock catch (805) and a ring two (806), the outer side of the fixing seat (801) is fixedly connected with the lock head (802), the upper end of the fixing seat (801) is fixedly connected with the ring one (803), the front end of the fixing seat (801) is rotatably connected with the rotating seat (804), the outer side of the rotating seat (804) is fixedly connected with the lock catch (805), the upper end of the rotating seat (804) is fixedly connected with the ring two (806), the locking assembly (8) is provided with two symmetrical and same ones, the ring one (803) and the ring two (806) are all adapted to the outer wall of the liquid carbon dioxide tank (9) and the compressed gas tank (12), and the lock head (802) and the lock catch (805) are in buckling connection.

4. The snow-flake cleaning device for pre-treatment of plastic parts before painting according to claim 1, characterized in that: The compressed gas tank (12) and the liquid carbon dioxide tank (9) are the same in structure.

5. The snow-flake cleaning device for pre-treatment of plastic parts before painting according to claim 1, characterized in that: The structure of the adjusting part one (1910) and the adjusting part two (1911) is symmetrical, the adjusting part one (1910) and the adjusting part two (1911) are connected by two gears (1909), the gear (1909) of the adjusting part one (1910) is fixedly connected with a worm wheel (1913), and the worm (1914) is in meshing connection with the worm wheel (1913).

6. The snow-flake cleaning device for pre-treatment of plastic parts before painting according to claim 1, characterized in that: The cross-sectional area of the nozzle (1902) gradually decreases from the input end to the output end.

7. The snow-flake cleaning device for pre-treatment of plastic parts before painting according to claim 1, characterized in that: The control switch (1906) is electrically connected with the electromagnetic valve two (17), the adjusting button (1904) is electrically connected with the motor (1915), and the control panel (14) is electrically connected with the confluence box (13), the liquid carbon dioxide tank (9), the compressed gas tank (12), the slide rail assembly one (4) and the slide rail assembly two (5).

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